Double-row series four-point contact ball bearing

Abstract

The utility model discloses a double-row series four-point contact ball bearing, and belongs to the field of bearings. The inner wall of the bearing outer ring is provided with a first outer ring channel and a second outer ring channel which are distributed in parallel; a first inner ring channel and a second inner ring channel which are distributed in parallel are formed in the outer wall of the bearing inner ring; the rolling bodies comprise a first rolling body and a second rolling body, the retainer comprises a first retainer and a second retainer, and the first outer ring channel, the second outer ring channel, the first inner ring channel and the second inner ring channel are all peach-shaped channels formed by double arcs; the peach-shaped channel comprises two rolling contact parts which are symmetrically arranged and are in contact with the rolling body, and a gap part positioned between the two rolling contact parts. The double-row series four-point contact ball bearing has the beneficial effect that the rigidity and the bearing capacity of the bearing are improved.

Description

Technical Field

[0001] The present application relates to the field of bearings, and in particular to a double-row tandem four-point contact ball bearing. Background Art

[0002] Traditional double-row angular contact ball bearings or double-row deep groove ball bearings generally include a bearing outer ring, a bearing inner ring, a cage and double-row rolling elements. Due to structural limitations, their internal load-bearing capacity is insufficient and cannot meet the load-bearing requirements.

[0003] Whether it is an "O" type or an "X" type double-row angular contact ball bearing, due to the angular contact working state, when it bears axial load, only one row of rolling elements bears the axial load, and the other row of rolling elements is suspended, so the load-bearing capacity is very limited and useless. In addition, it is well known that rolling bearings require minimum load, and the rolling elements of the raceway with suspended rolling elements will slip, which is particularly risky at high speeds.

[0004] When a double-row deep groove ball bearing is subjected to axial load, it is possible that two rows of rolling elements bear the axial load, but the contact angle is small, the axial load-bearing capacity is weak, and the service life is relatively poor. If a larger axial load is to be borne, a larger radial clearance is required, which leads to larger axial movement and angular swing, and insufficient positioning accuracy.

[0005] The static safety factor of double-row angular contact ball bearings and double-row deep groove ball bearings is often insufficient when they are subjected to radial forces at low speeds. Utility Model Content

[0006] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a double-row tandem four-point contact ball bearing, including:

[0008] The inner wall of the bearing outer ring is provided with a first outer ring groove and a second outer ring groove distributed in parallel;

[0009] The outer wall of the bearing inner ring is provided with a first inner ring groove and a second inner ring groove distributed in parallel;

[0010] The rolling body comprises a first rolling body and a second rolling body, wherein the first rolling body is located in a raceway formed by the first outer ring groove and the first inner ring groove; and the second rolling body is located in a raceway formed by the second outer ring groove and the second inner ring groove;

[0011] The cage includes a first cage and a second cage, the first cage is arranged on the first rolling body; the second cage is arranged on the second rolling body;

[0012] The first outer ring groove, the second outer ring groove, the first inner ring groove and the second inner ring groove are all peach-shaped grooves composed of double arcs; the peach-shaped groove includes two symmetrically arranged rolling contact parts in contact with the rolling body, and a gap part located between the two rolling contact parts.

[0013] The present application uses parallel distribution to reduce the relative radial and axial runout between the raceways, thereby improving the bearing accuracy and high-speed performance and making the load distribution more uniform. During the axial load-bearing process, the left half of the arc groove of the first outer ring groove and the second outer ring groove or the right half of the arc groove of the second outer ring groove are in series contact to form an angular contact working state, and the axial load is evenly distributed; the corresponding first inner ring groove and the right half of the arc groove of the second inner ring groove or the left half of the arc groove of the second inner ring groove are in series contact to form an angular contact working state, and the axial load is evenly distributed. When bearing radial loads, the left and right half of the arc grooves of the first outer ring groove and the second outer ring groove and the left and right half of the arc grooves of the first inner ring groove and the second inner ring groove are all under load, with a total of 8 contact ellipses, which greatly improves the static load capacity by 1.6 times and the dynamic load capacity by 1.6 times compared with double-row angular contact bearings. At the same time, due to the use of a four-point contact series structure, the axial clearance is small, the axial and radial accuracy is high, the load capacity is large, and it has high application and economic value.

[0014] Furthermore, the first outer ring channel is composed of two arcs with a distance Ae1 from the left and right side channels to the channel center to form a first outer ring peach-shaped channel; the second outer ring channel is composed of two arcs with a distance Ae1 from the left and right side channels to the channel center to form a second outer ring peach-shaped channel; the first outer ring peach-shaped channel and the second outer ring peach-shaped channel are distributed in parallel.

[0015] Furthermore, the first inner circle channel is composed of two arcs with a distance from the left and right side channels to the channel center of Ai1 to form a first inner circle peach-shaped channel; the second inner circle channel is composed of two arcs with a distance from the left and right side channels to the channel center of Ai1 to form a second inner circle peach-shaped channel, and the first inner circle peach-shaped channel and the second inner circle peach-shaped channel are distributed in parallel.

[0016] Furthermore, the distance between the center of the first rolling element and the axis center line of the inner ring of the bearing is consistent with the distance between the center of the second rolling element and the axis center line of the inner ring of the bearing.

[0017] Furthermore, the outer ring of the bearing also includes a first outer ring end face, a first flange portion, a second flange portion, a third flange portion, and a second outer ring end face; two ends of the first flange portion are respectively connected to the first outer ring end face and the first outer ring groove, two ends of the second flange portion are respectively connected to the first outer ring groove and the second outer ring groove, and two ends of the third flange portion are respectively connected to the second outer ring groove and the second outer ring end face.

[0018] Furthermore, the first rib portion, the second rib portion and the third rib portion are all made of smooth surfaces.

[0019] Further, the length of the second rib portion is greater than the lengths of the first rib portion and the third rib portion.

[0020] Furthermore, the bearing inner ring also includes a first inner ring end face, a first connecting portion, a second connecting portion, a third connecting portion, and a second inner ring end face; two ends of the first connecting portion are respectively connected to the first inner ring end face and the first inner ring channel, two ends of the second connecting portion are respectively connected to the first inner ring channel and the second inner ring channel, and two ends of the third connecting portion are respectively connected to the second inner ring channel and the second inner ring end face.

[0021] Furthermore, the first connection portion, the second connection portion, and the third connection portion all adopt smooth surfaces.

[0022] Furthermore, the length of the second connecting portion is greater than the lengths of the first connecting portion and the third connecting portion.

[0023] The beneficial effect of the present application is that it provides a double-row tandem four-point contact ball bearing that improves bearing rigidity and load-bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0025] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements.

[0026] Schematically, components and elements are not necessarily drawn to scale.

[0027] In the attached picture:

[0028] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0029] Figure 2 It is a structural schematic diagram of a part of the embodiment, mainly showing the outer ring of the bearing and the inner ring of the bearing;

[0030] Figure 3 yes Figure 1 A magnified view of part A;

[0031] Figure 4 It is a structural schematic diagram of a part of an embodiment, mainly showing a peach-shaped channel;

[0032] Figure 5is an overall schematic diagram according to an embodiment of the present application;

[0033] Figure 6 is an overall schematic diagram according to an embodiment of the present application;

[0034] Figure 7 It is an overall schematic diagram according to an embodiment of the present application.

[0035] Reference numerals:

[0036] 1. Bearing outer ring; 2. Bearing inner ring; 3. First rolling element; 4. Second rolling element; 5. First retaining frame; 6. Second retaining frame; 7. First outer ring groove; 8. Second outer ring groove; 9. First inner ring groove; 10. Second inner ring groove; 11. First outer ring peach-shaped groove; 12. Second outer ring peach-shaped groove; 13. First inner ring peach-shaped groove; 14. Second inner ring peach-shaped groove; 15. First outer ring end face; 16. First flange portion; 17. Second flange portion; 18. Third flange portion; 19. Second outer ring end face; 20. First inner ring end face; 21. First connecting portion; 22. Second connecting portion; 23. Third connecting portion; 24. Second inner ring end face; 25. Rolling contact portion; 26. Gap portion. DETAILED DESCRIPTION

[0037] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0038] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0039] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0040] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0041] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] Reference Figure 1-7 , a double-row tandem four-point contact ball bearing comprises a bearing outer ring 1, a bearing inner ring 2, double-row steel balls, and a cage; the inner wall of the bearing outer ring 1 is provided with a first outer ring groove 7 and a second outer ring groove 8 distributed in parallel, the inner wall of the bearing inner ring 2 is provided with a first inner ring groove 9 and a second inner ring groove 10, the double-row steel balls comprise a first rolling body 3 and a second rolling body 4, and the cage comprises a first cage 5 and a second cage 6. The first rolling body 3 is located in the raceway formed by the first outer ring groove 7 and the first inner ring groove 9; the second rolling body 4 is located in the raceway formed by the second outer ring groove 8 and the second inner ring groove 10; the first cage 5 is arranged on the first rolling body 3; the second cage 6 is arranged on the second rolling body 4. Among them, the first outer ring groove 7, the second outer ring groove 8, the first inner ring groove 9, and the second inner ring groove 10 are all peach-shaped grooves formed by double arcs, and the contact angles a and a' and b and b' of the peach-shaped grooves are designed according to the external load and the rotation speed. Specifically, the peach-shaped groove includes two symmetrically arranged rolling contact parts in contact with the rolling element, and a gap part between the two rolling contact parts. Through parallel distribution, the relative radial and axial runout between the raceways is small, thereby improving the bearing accuracy and high-speed performance and more uniform load distribution. During the axial load-bearing process, the left half of the arc groove or the right half of the arc groove of the first outer ring groove 7 and the second outer ring groove 8 is in series contact, forming an angular contact working state, and evenly distributing the axial load; the corresponding right half of the arc groove or the left half of the arc groove of the first inner ring groove 9 and the second inner ring groove 10 is in series contact, forming an angular contact working state, and evenly distributing the axial load. When bearing radial load, the left and right half of the arc groove of the first outer ring groove 7 and the second outer ring groove 8 and the left and right half of the arc groove of the first inner ring groove 9 and the second inner ring groove 10 are all under load, with a total of 8 contact ellipses, which greatly improves the static load capacity by 1.6 times and the dynamic load capacity by 1.6 times compared with the double-row angular contact bearing. At the same time, due to the four-point contact series structure, the axial clearance is small, the axial and radial precision is high, the load-bearing capacity is large, and it has high application and economic value.

[0043] The first outer ring groove 7 is composed of two arc sections with a distance Ae1 from the groove center to the left and right sides to form a first outer ring peach-shaped groove 11; the second outer ring groove 8 is composed of two arc sections with a distance Ae1 from the groove center to the left and right sides to form a second outer ring peach-shaped groove 12; the first outer ring peach-shaped groove 11 and the second outer ring peach-shaped groove 12 are distributed in parallel.

[0044] The first inner circle groove 9 is composed of two arc sections with a distance from the left and right sides to the groove center of Ai 1 to form a first inner circle peach-shaped groove 13; the second inner circle groove 10 is composed of two arc sections with a distance from the left and right sides to the groove center of Ai 1 to form a second inner circle peach-shaped groove 14, and the first inner circle peach-shaped groove 13 and the second inner circle peach-shaped groove 14 are distributed in parallel.

[0045] The first rolling element 3 and the first retaining frame 5 are located between the first outer ring peach-shaped groove 11 and the first inner ring peach-shaped groove 13. The second rolling element 4 and the second retaining frame 6 are located between the second outer ring peach-shaped groove 12 and the second inner ring peach-shaped groove 14.

[0046] The left half circular arc groove center diameter Le1 of the first outer ring groove 7 and the second outer ring groove 8 is equal to the right half circular arc groove center diameter Le2 of the first outer ring groove 7 and the second outer ring groove 8.

[0047] The center diameter L i1 of the left half circular arc groove of the first inner ring groove 9 and the second inner ring groove 10 is equal to the center diameter L i2 of the right half circular arc groove of the first inner ring groove 9 and the second inner ring groove 10.

[0048] The first rolling element 3 and the second rolling element 4 have the same size, and the distance between the center of the first rolling element 3 and the axis of the bearing inner ring 2 is consistent with the distance between the center of the second rolling element 4 and the axis of the bearing inner ring 2.

[0049] The materials of the first retainer 5 and the second retainer 6 are steel plate stamping retainer, nylon 46, nylon 66 or phenolic pressed cloth tube, nylon 46, nylon 66 plus 25% or 30% glass fiber.

[0050] The outer ring 1 of the bearing further includes a first outer ring end face 15, a first flange portion 16, a second flange portion 17, a third flange portion 18, and a second outer ring end face 19; the first flange portion 16 has two ends connected to the first outer ring end face 15 and the first outer ring channel 7, the second flange portion 17 has two ends connected to the first outer ring channel 7 and the second outer ring channel 8, and the third flange portion 18 has two ends connected to the second outer ring channel 8 and the second outer ring end face 19. Among them, the first flange portion 16, the second flange portion 17, and the third flange portion 18 all adopt smooth surfaces, and the length of the second flange portion 17 is greater than that of the first flange portion 16 and the third flange portion 18. Therefore, the rotating surfaces of the first rolling element 3 and the second rolling element 4 will not be damaged due to excessive reduction in service life, thereby ensuring their durability, while also ensuring axial space, and improving the rigidity and load-bearing capacity of the bearing.

[0051] The bearing inner ring 2 further includes a first inner ring end face 20, a first connection portion 21, a second connection portion 22, a third connection portion 23, and a second inner ring end face 24; the first connection portion 21 has two ends connected to the first inner ring end face 20 and the first inner ring channel 9, the second connection portion 22 has two ends connected to the first inner ring channel 9 and the second inner ring channel 10, and the third connection portion 23 has two ends connected to the second inner ring channel 10 and the second inner ring end face 24. The first connection portion 21, the second connection portion 22, and the third connection portion 23 all have smooth surfaces, and the length of the second connection portion 22 is greater than the length of the first connection portion 21 and the third connection portion 23.

[0052] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A double-row tandem four-point contact ball bearing, comprising: The inner wall of the bearing outer ring is provided with a first outer ring groove and a second outer ring groove distributed in parallel; The outer wall of the bearing inner ring is provided with a first inner ring groove and a second inner ring groove distributed in parallel; The rolling body comprises a first rolling body and a second rolling body, wherein the first rolling body is located in a raceway formed by the first outer ring groove and the first inner ring groove; and the second rolling body is located in a raceway formed by the second outer ring groove and the second inner ring groove; The cage includes a first cage and a second cage, wherein the first cage is arranged on the first rolling body; and the second cage is arranged on the second rolling body; Features: The first outer ring groove, the second outer ring groove, the first inner ring groove and the second inner ring groove are all peach-shaped grooves composed of double arcs; the peach-shaped groove includes two symmetrically arranged rolling contact parts in contact with the rolling body, and a gap part located between the two rolling contact parts.

2. The double-row tandem four-point contact ball bearing according to claim 1, characterized in that: The first outer ring channel is composed of two arc sections with a distance of Ae1 from the left and right side channels to the channel center to form a first outer ring peach-shaped channel; the second outer ring channel is composed of two arc sections with a distance of Ae1 from the left and right side channels to the channel center to form a second outer ring peach-shaped channel; the first outer ring peach-shaped channel and the second outer ring peach-shaped channel are distributed in parallel.

3. The double-row tandem four-point contact ball bearing according to claim 1, characterized in that: The first inner circle channel is composed of two arc sections with a distance from the left and right sides of the channel to the channel center of Ai1 to form a first inner circle peach-shaped channel; the second inner circle channel is composed of two arc sections with a distance from the left and right sides of the channel to the channel center of Ai1 to form a second inner circle peach-shaped channel, and the first inner circle peach-shaped channel and the second inner circle peach-shaped channel are distributed in parallel.

4. The double-row tandem four-point contact ball bearing according to claim 1, characterized in that: The distance between the center of the first rolling element and the axis of the inner ring of the bearing is consistent with the distance between the center of the second rolling element and the axis of the inner ring of the bearing.

5. The double-row tandem four-point contact ball bearing according to claim 1, characterized in that: The bearing outer ring also includes a first outer ring end face, a first flange portion, a second flange portion, a third flange portion, and a second outer ring end face; two ends of the first flange portion are respectively connected to the first outer ring end face and the first outer ring groove, two ends of the second flange portion are respectively connected to the first outer ring groove and the second outer ring groove, and two ends of the third flange portion are respectively connected to the second outer ring groove and the second outer ring end face.

6. The double-row tandem four-point contact ball bearing according to claim 5, characterized in that: The first rib portion, the second rib portion and the third rib portion all adopt smooth surfaces.

7. The double-row tandem four-point contact ball bearing according to claim 5, characterized in that: The length of the second rib portion is greater than the length of the first rib portion and the third rib portion.

8. The double-row tandem four-point contact ball bearing according to claim 1, characterized in that: The bearing inner ring also includes a first inner ring end face, a first connecting portion, a second connecting portion, a third connecting portion, and a second inner ring end face; two ends of the first connecting portion are respectively connected to the first inner ring end face and the first inner ring channel, two ends of the second connecting portion are respectively connected to the first inner ring channel and the second inner ring channel, and two ends of the third connecting portion are respectively connected to the second inner ring channel and the second inner ring end face.

9. The double-row tandem four-point contact ball bearing according to claim 8, characterized in that: The first connection part, the second connection part and the third connection part are all made of smooth surfaces.

10. The double-row tandem four-point contact ball bearing according to claim 8, characterized in that: The length of the second connection portion is greater than the lengths of the first connection portion and the third connection portion.

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